A solar biogas device

The utility model aims to provide a solar biogas device which has simple structure, convenient use and can sufficiently utilizes solar energy resource and can optionally change mounting positions. The solar biogas device comprises a biogas tank and a solar thermal collector; the biogas tank is connected with the solar thermal collector. The biogas tank comprises a feeding inlet, a discharge outlet, a viewing window and a lower tank body; the feeding inlet and the discharge outlet are arranged on two lateral surfaces of the lower tank body; the viewing window is positioned at one end surface of the lower tank body. The solar thermal collector comprises an upper tank body, a vacuum thermal collecting tube and a gas transmission pipe; the vacuum thermal collecting tube is positioned at the outer surface of the upper tank body and the gas transmission pipe is arranged above the upper tank body. The solar biogas device utilizes heat generated by solar energy to supply necessary temperature condition for a biogas g